Currently in the United States, about one in four adults suffer from a diagnosable mind or mood disorder each year. In fact, 14.8 million American adults suffer from depression and 5.7 million suffer from bipolar disorder, according to the National Institute of Mental Health.

Despite the fact that mind and mood disorders are a timeless and widespread problem, stigma and misunderstanding still surround the conditions.

Johnson discussed some common misconceptions and myths on mind and mood disorders on ABC's "Good Morning America" today.

To help contribute to the growing understanding and awareness of mental illness, make sure you know what's true and what's not when it comes to your mind and mood.

Actually, those who are in early adulthood do need to watch out for depression.

"The age of first onset of depression is far younger than we used to believe," said Myrna Weissman, a psychiatrist at the New York State Psychiatric Institute and a participant in the OnCall+ Depression resource section of ABCNEWS.com.

"Major depression has the highest risk of developing between the ages of 15 and 34," Weissman said.

This finding goes against the common school of thought -- that middle-age adults and women going through menopause are most at risk of developing the disease.

However, several large-scale studies found that the most common period of life for depression to develop was the beginning of adulthood, not the middle of it.

Weissman noted that depression can still set in at any age, however.

"There are some people who first get depressed when they're elderly, and they have no history of depression," she said. "And oftentimes there is some other underlying biological cause of that."

In general. people of every age should look out for the tell-tale signs of depression -- ongoing sadness and anxiety, changes in sleep and eating habits -- and seek out professional help.